Berkeley Threshold Days by Year (USC00040693)

12 fixed thresholds counted per year at Berkeley (USC00040693): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Berkeley Thresholds

Berkeley: days with a maximum temperature at or above 30 C (86 F) in 116 years, most in 2008 with 30.
Berkeley: days with 10 mm (0.39 in) or more of precipitation in 102 years, most in 1983 with 48.
Berkeley: days with 25 mm (0.98 in) or more of precipitation in 100 years, most in 1983 with 16.
Berkeley: days with a maximum temperature at or above 90 F (32.2 C) in 97 years, most in 2003 with 13.
12 fixed thresholds have at least one qualifying day at Berkeley.

Days at or above 30 C (86 F)

116 years with a qualifying day

Days per year at Berkeley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 30 in 2008.

Days at or above 30 C (86 F) per year at Berkeley
Year	Days	Decade average
1893	1	3
1894	6	3
1895	5	3
1896	2	3
1897	2	3
1898	4	3
1899	1	3
1900	3	3.5
1901	4	3.5
1905	5	3.5
1906	2	3.5
1908	2	3.5
1909	5	3.5
1910	4	6.9
1911	1	6.9
1912	11	6.9
1913	13	6.9
1914	7	6.9
1915	7	6.9
1916	7	6.9
1918	4	6.9
1919	8	6.9
1920	3	5.8
1921	16	5.8
1922	9	5.8
1923	7	5.8
1924	3	5.8
1925	3	5.8
1926	3	5.8
1927	2	5.8
1928	3	5.8
1929	9	5.8
1930	2	4.2
1931	6	4.2
1932	1	4.2
1933	4	4.2
1934	4	4.2
1935	2	4.2
1936	4	4.2
1937	5	4.2
1939	10	4.2
1940	1	4.1
1941	2	4.1
1942	3	4.1
1943	7	4.1
1944	2	4.1
1945	3	4.1
1946	4	4.1
1947	9	4.1
1948	3	4.1
1949	7	4.1
1950	10	6
1951	9	6
1952	7	6
1953	5	6
1954	5	6
1955	4	6
1956	4	6
1957	4	6
1958	5	6
1959	7	6
1960	3	4
1961	12	4
1962	2	4
1963	2	4
1964	3	4
1965	1	4
1966	7	4
1967	2	4
1968	4	4
1970	14	8.1
1972	5	8.1
1973	9	8.1
1974	4	8.1
1975	4	8.1
1976	16	8.1
1977	4	8.1
1978	10	8.1
1979	7	8.1
1980	5	6
1981	10	6
1982	2	6
1983	9	6
1984	9	6
1985	5	6
1986	1	6
1987	7	6
1990	4	5.2
1994	2	5.2
1995	7	5.2
1996	3	5.2
1998	6	5.2
1999	9	5.2
2000	8	16.6
2001	16	16.6
2002	17	16.6
2003	25	16.6
2004	22	16.6
2005	6	16.6
2006	11	16.6
2007	12	16.6
2008	30	16.6
2009	19	16.6
2010	10	11.2
2011	11	11.2
2012	7	11.2
2013	5	11.2
2014	12	11.2
2015	19	11.2
2016	8	11.2
2017	20	11.2
2018	6	11.2
2019	14	11.2
2022	15	8.7
2023	8	8.7
2025	3	8.7

For each year, a bar from the first to the last day at Berkeley meeting 30 C (86 F).

First to last qualifying date each year at Berkeley
Year	First date	Last date
1893	1893-06-03	1893-06-03
1894	1894-08-27	1894-10-04
1895	1895-05-11	1895-09-26
1896	1896-05-25	1896-05-26
1897	1897-05-19	1897-09-16
1898	1898-06-04	1898-07-01
1899	1899-10-08	1899-10-08
1900	1900-08-01	1900-09-22
1901	1901-06-28	1901-10-22
1905	1905-05-15	1905-07-07
1906	1906-06-19	1906-07-01
1908	1908-06-28	1908-09-29
1909	1909-06-23	1909-09-22
1910	1910-04-22	1910-05-30
1911	1911-05-20	1911-05-20
1912	1912-05-31	1912-10-14
1913	1913-04-24	1913-10-19
1914	1914-03-17	1914-10-14
1915	1915-07-16	1915-10-28
1916	1916-04-30	1916-09-27
1918	1918-06-02	1918-10-30
1919	1919-06-01	1919-10-07
1920	1920-06-01	1920-09-28
1921	1921-04-27	1921-11-04
1922	1922-05-14	1922-09-25
1923	1923-03-27	1923-10-19
1924	1924-04-06	1924-05-29
1925	1925-06-23	1925-10-20
1926	1926-09-24	1926-10-27
1927	1927-06-30	1927-10-12
1928	1928-09-14	1928-09-21
1929	1929-06-21	1929-10-22
1930	1930-10-05	1930-10-06
1931	1931-05-08	1931-07-04
1932	1932-09-09	1932-09-09
1933	1933-10-05	1933-10-18
1934	1934-06-29	1934-10-09
1935	1935-09-16	1935-09-17
1936	1936-09-07	1936-09-26
1937	1937-06-26	1937-10-21
1939	1939-09-16	1939-10-30
1940	1940-10-11	1940-10-11
1941	1941-05-10	1941-10-03
1942	1942-05-20	1942-09-14
1943	1943-05-22	1943-09-22
1944	1944-09-08	1944-09-09
1945	1945-06-15	1945-09-28
1946	1946-08-02	1946-09-28
1947	1947-05-01	1947-09-21
1948	1948-07-14	1948-09-13
1949	1949-05-05	1949-09-22
1950	1950-05-29	1950-10-10
1951	1951-05-25	1951-10-07
1952	1952-03-25	1952-10-01
1953	1953-06-24	1953-10-05
1954	1954-06-20	1954-10-14
1955	1955-06-04	1955-09-04
1956	1956-05-15	1956-09-22
1957	1957-06-17	1957-09-07
1958	1958-05-15	1958-09-27
1959	1959-07-09	1959-10-24
1960	1960-06-02	1960-09-25
1961	1961-06-14	1961-10-16
1962	1962-06-19	1962-08-27
1963	1963-07-26	1963-09-25
1964	1964-09-19	1964-09-24
1965	1965-10-24	1965-10-24
1966	1966-04-15	1966-10-09
1967	1967-09-19	1967-09-20
1968	1968-08-29	1968-09-25
1970	1970-05-15	1970-10-01
1972	1972-05-13	1972-10-06
1973	1973-06-08	1973-09-28
1974	1974-10-12	1974-10-17
1975	1975-05-28	1975-09-24
1976	1976-05-12	1976-10-12
1977	1977-07-29	1977-08-29
1978	1978-05-18	1978-10-13
1979	1979-05-30	1979-09-12
1980	1980-06-27	1980-10-03
1981	1981-04-28	1981-08-27
1982	1982-08-06	1982-09-11
1983	1983-05-19	1983-10-26
1984	1984-05-27	1984-09-28
1985	1985-07-01	1985-10-04
1986	1986-06-09	1986-06-09
1987	1987-04-21	1987-10-05
1990	1990-06-08	1990-10-09
1994	1994-06-10	1994-09-15
1995	1995-06-24	1995-10-02
1996	1996-06-02	1996-07-20
1998	1998-06-17	1998-08-11
1999	1999-07-12	1999-10-11
2000	2000-05-22	2000-09-20
2001	2001-05-08	2001-10-15
2002	2002-06-06	2002-10-08
2003	2003-05-28	2003-10-29
2004	2004-03-17	2004-10-14
2005	2005-07-12	2005-10-01
2006	2006-05-15	2006-09-26
2007	2007-05-07	2007-10-24
2008	2008-04-13	2008-10-26
2009	2009-04-20	2009-09-28
2010	2010-06-13	2010-10-15
2011	2011-05-05	2011-10-24
2012	2012-06-11	2012-11-06
2013	2013-05-03	2013-10-07
2014	2014-05-01	2014-10-13
2015	2015-05-01	2015-10-14
2016	2016-04-07	2016-09-28
2017	2017-05-02	2017-10-27
2018	2018-06-24	2018-10-15
2019	2019-04-24	2019-09-26
2022	2022-04-07	2022-10-19
2023	2023-08-20	2023-10-07
2025	2025-08-21	2025-08-31

Every Fixed Threshold

Fixed thresholds at Berkeley
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	116	30	2008	3
35 C (95 F): Days	44	6	2003	1
40 C (104 F): Days	5	2	2017	1
90 F (32.2 C): Days	97	13	2003	1
100 F (37.8 C): Days	13	2	2008	2
0 C (32 F): Frost days (min	45	11	1949	5
20 C (68 F): Tropical nights (min	22	3	1939	1
10 mm (0.39 in): Days with 10 mm or more rain	102	48	1983	24
25 mm (0.98 in): Days with 25 mm or more rain	100	16	1983	8
50 mm (1.97 in): Days with 50 mm or more rain	55	5	1981	2
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1967	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	1	1922	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Berkeley threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Berkeley Threshold Days by Year (USC00040693)

Key Facts for Berkeley Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related